Scholarly environment trained adult about uprising (8)
I believe the answer is:
academia
'scholarly environment' is the definition.
(the scholarly or academic world)
'trained adult about uprising' is the wordplay.
'trained' becomes 'aimed' ('aim' can be a synonym of 'train').
'adult' becomes 'a' (abbreviation).
'about' becomes 'ca' (short for circa).
'uprising' says the letters should be written in reverse.
'aimed'+'a'+'ca'='aimedaca'
'aimedaca' written backwards gives 'ACADEMIA'.
(Other definitions for academia that I've seen before include "The world of college or university" , "The world of scholarship" , "Teaching environment" , "Scholarly world" , "Educational community" .)